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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <proc/scheduler.h>
  30. #include <proc/thread.h>
  31. #include <proc/task.h>
  32. #include <mm/heap.h>
  33. #include <mm/frame.h>
  34. #include <mm/page.h>
  35. #include <arch/asm.h>
  36. #include <arch.h>
  37. #include <synch/synch.h>
  38. #include <synch/spinlock.h>
  39. #include <synch/waitq.h>
  40. #include <synch/rwlock.h>
  41. #include <cpu.h>
  42. #include <func.h>
  43. #include <context.h>
  44. #include <list.h>
  45. #include <typedefs.h>
  46. #include <time/clock.h>
  47. #include <list.h>
  48.  
  49. char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"};
  50.  
  51. spinlock_t threads_lock;
  52. link_t threads_head;
  53.  
  54. static spinlock_t tidlock;
  55. __u32 last_tid = 0;
  56.  
  57. /*
  58.  * cushion() is provided to ensure that every thread
  59.  * makes a call to thread_exit() when its implementing
  60.  * function returns.
  61.  *
  62.  * cpu_priority_high()'d
  63.  */
  64. void cushion(void)
  65. {
  66.     void (*f)(void *) = the->thread->thread_code;
  67.     void *arg = the->thread->thread_arg;
  68.  
  69.     /* this is where each thread wakes up after its creation */
  70.     spinlock_unlock(&the->thread->lock);
  71.     cpu_priority_low();
  72.  
  73.     f(arg);
  74.     thread_exit();
  75.     /* not reached */
  76. }
  77.  
  78. void thread_init(void)
  79. {
  80.     the->thread = NULL;
  81.     nrdy = 0;
  82.     spinlock_initialize(&threads_lock);
  83.     list_initialize(&threads_head);
  84. }
  85.  
  86. void thread_ready(thread_t *t)
  87. {
  88.     cpu_t *cpu;
  89.     runq_t *r;
  90.     pri_t pri;
  91.     int i;
  92.  
  93.     pri = cpu_priority_high();
  94.  
  95.     spinlock_lock(&t->lock);
  96.  
  97.     i = (t->pri < RQ_COUNT -1) ? ++t->pri : t->pri;
  98.    
  99.     cpu = the->cpu;
  100.     if (t->flags & X_WIRED) {
  101.         cpu = t->cpu;
  102.     }
  103.     spinlock_unlock(&t->lock);
  104.    
  105.         /*
  106.      * Append t to respective ready queue on respective processor.
  107.      */
  108.     r = &cpu->rq[i];
  109.     spinlock_lock(&r->lock);
  110.     list_append(&t->rq_link, &r->rq_head);
  111.     r->n++;
  112.     spinlock_unlock(&r->lock);
  113.  
  114.     spinlock_lock(&nrdylock);
  115.     nrdy++;
  116.     spinlock_unlock(&nrdylock);
  117.  
  118.     spinlock_lock(&cpu->lock);
  119.     cpu->nrdy++;
  120.     spinlock_unlock(&cpu->lock);
  121.    
  122.     cpu_priority_restore(pri);
  123. }
  124.  
  125. thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
  126. {
  127.     thread_t *t;
  128.     __address frame_ks, frame_us = NULL;
  129.  
  130.     t = (thread_t *) malloc(sizeof(thread_t));
  131.     if (t) {
  132.         pri_t pri;
  133.    
  134.         spinlock_initialize(&t->lock);
  135.    
  136.         frame_ks = frame_alloc(FRAME_KA);
  137.         if (THREAD_USER_STACK & flags) {
  138.             frame_us = frame_alloc(0);
  139.         }
  140.  
  141.         pri = cpu_priority_high();
  142.         spinlock_lock(&tidlock);
  143.         t->tid = ++last_tid;
  144.         spinlock_unlock(&tidlock);
  145.         cpu_priority_restore(pri);
  146.  
  147.         memsetb(frame_ks, THREAD_STACK_SIZE, 0);
  148.         link_initialize(&t->rq_link);
  149.         link_initialize(&t->wq_link);
  150.         link_initialize(&t->th_link);
  151.         link_initialize(&t->threads_link);
  152.         t->kstack = (__u8 *) frame_ks;
  153.         t->ustack = (__u8 *) frame_us;
  154.        
  155.        
  156.         context_save(&t->saved_context);
  157.         t->saved_context.pc = (__address) cushion;
  158.         t->saved_context.sp = (__address) &t->kstack[THREAD_STACK_SIZE-8];
  159.  
  160.         pri = cpu_priority_high();
  161.         t->saved_context.pri = cpu_priority_read();
  162.         cpu_priority_restore(pri);
  163.        
  164.         t->thread_code = func;
  165.         t->thread_arg = arg;
  166.         t->ticks = -1;
  167.         t->pri = -1;        /* start in rq[0] */
  168.         t->cpu = NULL;
  169.         t->flags = 0;
  170.         t->state = Entering;
  171.         t->call_me = NULL;
  172.         t->call_me_with = NULL;
  173.        
  174.         timeout_initialize(&t->sleep_timeout);
  175.         t->sleep_queue = NULL;
  176.         t->timeout_pending = 0;
  177.        
  178.         t->rwlock_holder_type = RWLOCK_NONE;
  179.        
  180.         t->task = task;
  181.        
  182.         /*
  183.          * Register this thread in the system-wide list.
  184.          */
  185.         pri = cpu_priority_high();     
  186.         spinlock_lock(&threads_lock);
  187.         list_append(&t->threads_link, &threads_head);
  188.         spinlock_unlock(&threads_lock);
  189.  
  190.         /*
  191.          * Attach to the containing task.
  192.          */
  193.         spinlock_lock(&task->lock);
  194.         list_append(&t->th_link, &task->th_head);
  195.         spinlock_unlock(&task->lock);
  196.  
  197.         cpu_priority_restore(pri);
  198.     }
  199.  
  200.     return t;
  201. }
  202.  
  203. void thread_exit(void)
  204. {
  205.     pri_t pri;
  206.  
  207. restart:
  208.     pri = cpu_priority_high();
  209.     spinlock_lock(&the->thread->lock);
  210.     if (the->thread->timeout_pending) { /* busy waiting for timeouts in progress */
  211.         spinlock_unlock(&the->thread->lock);
  212.         cpu_priority_restore(pri);
  213.         goto restart;
  214.     }
  215.     the->thread->state = Exiting;
  216.     spinlock_unlock(&the->thread->lock);
  217.     scheduler();
  218. }
  219.  
  220. void thread_sleep(__u32 sec)
  221. {
  222.         thread_usleep(sec*1000000);
  223. }
  224.    
  225. /*
  226.  * Suspend execution of current thread for usec microseconds.
  227.  */
  228. void thread_usleep(__u32 usec)
  229. {
  230.     waitq_t wq;
  231.                  
  232.     waitq_initialize(&wq);
  233.  
  234.     (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
  235. }
  236.  
  237. void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
  238. {
  239.     pri_t pri;
  240.    
  241.     pri = cpu_priority_high();
  242.     spinlock_lock(&the->thread->lock);
  243.     the->thread->call_me = call_me;
  244.     the->thread->call_me_with = call_me_with;
  245.     spinlock_unlock(&the->thread->lock);
  246.     cpu_priority_restore(pri);
  247. }
  248.